Reading stdout from an exec’d process from within a golang test

I have a main.go that I would like to read its standard output from when I exec it inside one of my tests. In my app_test.go I have:

func TestShutdown(t *testing.T) { timer := time.NewTimer(4 * time.Second) cmd := exec.Command("go", "run", "cmd/testing/main.go") stdout, err := cmd.StdoutPipe() if err != nil {     log.Fatal(err) } err = cmd.Start() if err != nil {     t.Logf("Error starting the go file: %s", err) } <-timer.C  buf := new(bytes.Buffer) buf.ReadFrom(stdout) s := buf.String() t.Logf("out: %s", s) 

}

My main.go simply is:

package main  import (     "fmt" )  func main() {     fmt.Println("hello world") } 

When I run the test it only prints: out: and not the expected hello world. I have attempted to read using cmd.Stdout as well cmd.Output() with the same result. Do I need to use exec.Wait()? I cannot figure out why the standard output is not being picked up in my test. Perhaps in tests you cannot read from standard out?

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